POST # 41 is 100 % correct about the Sunsation.
They are laminar flow interruptors as Regal boats intro those way back - end of year 1996 - 20 years ago with their new Fastrac hull - the 2100 series got that design first for regal and then rest of the models followed.

Also Regal boats went to court over that single step design as they were being sued by Harry Schoell over their hull bottom.

The purpose of the laminar flow interruptors are to do with corning and tight turns - hence the reason why they are added.

Pic below showing the Regal hull, 1997 year model 2100 series

http://www.iboats.com/sites/perduema...al2100lsr2.jpg